The "new gas"
None is required, but if you are seeing BLM's/LTFT's up over 138, you might bring down the Injector Constant a touch.
If OVER 128, then
BLM/128*Current Injector Constant.
If UNDER 128, then
128/BLM@Current Injector Constant
GM tends to push the injector constant a little high. I am running E85 100% in my 94 LT1 Fleetwood with excellent results with some timing tuning and Inj Constant set to around 18.3 for stock LT1 injectors (24.87 lb/hr is stock constant).
I need larger, but that is only for 100% E85.
E10 really doesn't need any tuning.
If OVER 128, then
BLM/128*Current Injector Constant.
If UNDER 128, then
128/BLM@Current Injector Constant
GM tends to push the injector constant a little high. I am running E85 100% in my 94 LT1 Fleetwood with excellent results with some timing tuning and Inj Constant set to around 18.3 for stock LT1 injectors (24.87 lb/hr is stock constant).
I need larger, but that is only for 100% E85.
E10 really doesn't need any tuning.
TECH Senior Member
Joined: Nov 2001
Posts: 7,036
Likes: 1
From: Lake Zurich, IL
ethanol only has about 75% of the energy as gasoline... so you'll lose a little gas mileage (negligable though... ~2-3%)
as for running better... initial fillup it may not feel 100% only because the PCM will be learning that it needs to add slightly more fuel (but this is well within the PCM learn factor) but after the first fillup should be same as before
Not sure when it's coming to NJ... only thing I can say is when you see the yellow sticker appear on the pump that says "this gasoline may contain up to 10% ethanol" it's been switched heh
as for running better... initial fillup it may not feel 100% only because the PCM will be learning that it needs to add slightly more fuel (but this is well within the PCM learn factor) but after the first fillup should be same as before
Not sure when it's coming to NJ... only thing I can say is when you see the yellow sticker appear on the pump that says "this gasoline may contain up to 10% ethanol" it's been switched heh
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TECH Fanatic
Joined: Aug 2005
Posts: 1,691
Likes: 1
From: Sunny London, UK
Yeah, its got a higher octane and lower energy. Id have thought timing might need adjustment due to the change in burn time from octane change.
Perhaps 10% isnt enough to make a significant difference!?
Perhaps 10% isnt enough to make a significant difference!?
Hmmmmmmmmm...I'm sure I've run into this gas before growing up in the Midwest...I'll have to see what it does to my tune since I run in open loop. I'm assuming it'll just run a bit lean all around...
As delivered to the pump, no. Ethanol is higher octane (110 or so in pure form) but they use a lower grade gasoline and add the E100 to it and you get your same pump octane, 87, 89, 93 depending on where you are.
In closed loop, the engine will still be stoch, the BLM's will creep up a little bit, to the low 130's at the most. I was running E85 and BLM's hovered in the 180's. In Open Loop, yup, just a tough leaner. 14.1:1 AFR for it for stoch.
Originally Posted by jjnada
will the octane ratings go up any?
Originally Posted by MeentSS02
Hmmmmmmmmm...I'm sure I've run into this gas before growing up in the Midwest...I'll have to see what it does to my tune since I run in open loop. I'm assuming it'll just run a bit lean all around...
Originally Posted by RamAirRocket
As delivered to the pump, no. Ethanol is higher octane (110 or so in pure form) but they use a lower grade gasoline and add the E100 to it and you get your same pump octane, 87, 89, 93 depending on where you are.
In closed loop, the engine will still be stoch, the BLM's will creep up a little bit, to the low 130's at the most. I was running E85 and BLM's hovered in the 180's. In Open Loop, yup, just a tough leaner. 14.1:1 AFR for it for stoch.
In closed loop, the engine will still be stoch, the BLM's will creep up a little bit, to the low 130's at the most. I was running E85 and BLM's hovered in the 180's. In Open Loop, yup, just a tough leaner. 14.1:1 AFR for it for stoch.
Nope, 14.1.
The PCM in open loop will be making fuel for 14.7, but the requiements of the engine are 14.1 (with E10), so it will be running lean, not getting the fuel it needs to be properly stoch. But then again, is this a way to do lean cruise?? Thanks to the politicians pushing 10% Ethanol, we all just drop into Open Loop and run our engines in the leaner mode, getting better fuel economy....
thanks! I never thought the politicians were worth crap until now!
The PCM in open loop will be making fuel for 14.7, but the requiements of the engine are 14.1 (with E10), so it will be running lean, not getting the fuel it needs to be properly stoch. But then again, is this a way to do lean cruise?? Thanks to the politicians pushing 10% Ethanol, we all just drop into Open Loop and run our engines in the leaner mode, getting better fuel economy....
thanks! I never thought the politicians were worth crap until now!
Originally Posted by MeentSS02
Do you mean 15.1:1?
Originally Posted by MeentSS02
Hmmmmmmmmm...I'm sure I've run into this gas before growing up in the Midwest...I'll have to see what it does to my tune since I run in open loop. I'm assuming it'll just run a bit lean all around...
TECH Regular
Joined: May 2005
Posts: 470
Likes: 4
Please someone tell me they've successfully used 10% ethanol fuel (at 93 octane), and using Hypertech Power Programmer Plus w/power tuning. I have an LT1, and the guy at Hypertech emails me back saying they haven't tested their product on ethanol-blended fuel, and the engine could ping/detonate. I am going to follow up with a phone call in case he thought I meant E85 instead of the E10.
Originally Posted by Pewter02TA
Do any of yall think that a new tune would be required for the 10% ethanol???
Thread Starter
Breakfast Fanatic
Joined: Sep 2002
Posts: 1,615
Likes: 0
From: Houston/Denton
Originally Posted by txhorns281
I would see your tuner right away before something blows up!!!!!!!!!!
Originally Posted by Pewter02TA
You ***, ok well the other day I was doing a test pass because I just filled up with this junk and when I shifted in third and hit around 6200 RPM my ses light started flashing. So I ordered new plugs and wires, and I will see if that helps the problem. And Will I think its time for a retune
